vb.net free barcode dll The Role of the Entity Object in Java

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The Role of the Entity Object
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The framework calls these methods whenever the value of an attribute is set or retrieved from the cache. So, if you want to force an attribute value to be displayed in uppercase, you could set the return value from the method getCustLastName() to uppercase using something like
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public String getCustLastName() { String lastName = (String)getAttributeInternal(CUSTLASTNAME); if (lastName != null) { return lastName.toUpperCase(); } else { return lastName; } }
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TIp It is good practice to test for null to prevent runtime exceptions.
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create() Method In the Select Java Options dialog, you chose to expose the following method:
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protected void create(AttributeList attributeList) { super.create(attributeList); }
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This is the method the framework will use when a new customer row is created, allowing you to augment the default behavior, such as setting default values.
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remove() Method You also chose to expose the following method:
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public void remove() { super.remove(); }
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This allows you to add your own code to the framework method called when a customer row is removed. For example, you can add validation logic to prevent the removal of a record if a certain condition is met.
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Data Manipulation Method The previously discussed methods are used to manage the data and rows within your entity object cache. At some point that data will be committed to the database, in which case the following method is called:
protected void doDML(int operation, TransactionEvent e) { super.doDML(operation, e); }
This method allows you to write code at the point at which cached rows are inserted, updated, or deleted from the database. This might be an ideal point for adding extra logic before data changes are passed to the database. The operation parameter allows the method to distinguish between DML_UPDATE, DML_INSERT, and DML_DELETE.
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TIp For each of these methods, go in and add some System.out .println() statements and then run the application module in the ADF Business Component Browser. This will output a message to the JDeveloper Log window indicating where the framework is reading and writing values and updating rows.
Reading a Sequence in EntityImpl
Of course, one of the common uses of the EntityImpl class is to add code to perform a specific action on an entity object instance. For example, the code could read a database sequence and assign the value to the CustomerId. Adding the following method to the CustomersImpl class provides the functionality to read the next value from a database sequence:
protected Number nextVal(String sequenceName) { SequenceImpl s = new SequenceImpl(sequenceName, getDBTransaction()); return s.getSequenceNumber(); }
NOTE If JDeveloper does not prompt you, you will need to explicitly import oracle.jbo.server.SequenceImpl. The code creates an object of type SequenceImpl, which represents a database sequence, the name of which is passed into the method. The call to getDBTransaction is a call to a method on the EntityImpl that, not surprisingly, returns information about the database transaction for this entity object. The method then returns the next value in that sequence. NOTE If one does not already exist, you may have to create an appropriate database sequence. You can do this in JDeveloper from the Database Navigator window by going to the database connection for your application and right-clicking Sequences and selecting New Sequence.
Calling the Sequence from the Entity Object
So, how do you call this method when a new customer is being created It s quite simple. You can call it from the create() method to set the value of CustomerId:
protected void create(AttributeList attributeList) { super.create(attributeList); setCustomerId(nextVal("Customer_Seq")); }
However, there is another way you can do this rather than adding code to the create() method. Earlier in the chapter you learned about default values and how they can be set for an entity object attribute. Wouldn t it be useful if you could define that this method should be called to resolve the default value for CustomerId
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